Filters: Tags: Tectonics (X)
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No abstract available
Categories: Publication;
Types: Citation;
Tags: ASFA 2: Ocean Technology Policy & Non-Living Resources; Ocea,
Coastal lagoons,
Coastal zone,
Coral reefs,
Holocene,
Categories: Publication;
Types: Citation;
Tags: Lead Radioisotopes,
Oceans,
Pacific Ocean,
SW 6050 Rock mechanics and geology,
Tectonics,
Categories: Publication;
Types: Citation;
Tags: Alluvial Fans,
Climatic Changes,
Coastal Waters,
Eustatic changes,
Geomorphology,
An exposure of a creeping segment of the Bartlett Springs Fault (BSF), part of the San Andreas Fault system in northern California, is a ~1.5‐m‐wide zone of serpentinite‐bearing fault gouge cutting through Late Pleistocene fluvial deposits. The fault gouge consists of porphyroclasts of antigorite serpentinite, talc, chlorite, and tremolite‐actinolite, along with some Franciscan metamorphic rocks, in a matrix of the same materials. The Mg‐mineral assemblage is stable at temperatures above 250–300 °C. The BSF gouge is interpreted to have been tectonically incorporated into the fault from depths near the base of the seismogenic zone and to have risen buoyantly to the surface where it is now undergoing right‐lateral...
Categories: Publication;
Types: Citation;
Tags: Dams,
Defects,
Dynamic loads,
EE 481.1 Geology; EE 441.1 Dams; EE 441.2 Reservoirs; EE 483,
Earthquake resistance,
The geologic record of coastal California includes evidence of numerous volcanic centers younger than 30 Ma that do not appear to have erupted in an arc setting. By correlating these volcanic centers with specific slab windows predicted from analysis of magnetic anomalies on the Pacific plate, we add new constraints to tectonic reconstructions since 30 Ma. Our correlations, such as erupting the Morro Rock–Islay Hill complex south of the Pioneer fracture zone and the Iversen Basalt south of the Mendocino fracture zone, require larger displacements within western North America than advocated by most previous authors. Specifically, we infer at least 315 km of motion between the Sierra Nevada and rigid North America...
The NE vergent Chocolate Mountains fault of south-eastern California has been interpreted as either a subduction thrust responsible for burial and prograde metamorphism of the ensimatic Orocopia Schist or as a normal fault involved in the exhumation of the schist. Our detailed structural analysis in the Gavilan Hills area provides new evidence to confirm the latter view. A zone of deformation is present at the top of the Orocopia Schist in which lineations are parallel to those in the upper plate of the Chocolate Mountains fault but oblique to ones at relatively deep levels in the schist. Both the Orocopia Schist and upper plate contain several generations of shear zones that show a transition from crystalloblastic...
Categories: Publication;
Types: Citation;
Tags: ASFA 2: Ocean Technology Policy & Non-Living Resources; Ocea,
Crustal structure,
Crustal thickness,
Kinematics,
Lithosphere,
Categories: Publication;
Types: Citation;
Tags: ASFA 2: Ocean Technology Policy & Non-Living Resources; Ocea,
Eustatic changes,
Holocene,
Holocene sea levels,
I, Pacific,
Categories: Publication;
Types: Citation;
Tags: Air exposure,
Algae,
Coastal morphology,
Coasts,
Corallinaceae,
Categories: Publication;
Types: Citation;
Tags: Aquatic Life,
Catchment Areas,
Catchment area,
Climatic Changes,
Coasts,
Categories: Publication;
Types: Citation;
Tags: Archaeology,
Drainage Patterns,
Dunes,
Egypt, Arab Rep., Sinai Peninsula,
Egypt, Arab Rep., Sinai Peninsula,
It is proposed that many summit basins along the Aleutian Arc form from the clockwise rotation of blocks of the arc massic. Summit basins are arc-parallel grabens or half-grabens formed within the arc massif and are commonly located near or along the axis of late Cenozoic volcanism. Geomorphically, the Aleutian Arc appears to consist of contiguous rhombic blocks of varying size, 10's to 100's of km in length. Presents a model for block rotation that involves translation of blocks parallel to an arc. It is suggested that block rotation, which appears to have accelerated in late Cenozoic time, is linked to: 1) a shift in the Euler pole for the Pacific plate; 2) the consequential start-up of late Cenozoic volcanism;...
Categories: Publication;
Types: Citation;
Tags: Kuwait,
SW 6050 Rock mechanics and geology,
Water Resources Abstracts,
classification,
climates,
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